Ric -
With the muffler, I only heard the noise after shutting the truck off after it had been running a while. Basically just an occassional 'ping' that would come from under the truck. I figured since I had the truck at the dealer I might as well have it taken care of. Hummer has issued a bulletin about this, the dealer just secures the muffler better with some aftermarket straps.
For the actuator, the problem I had -- and seems to be not uncommon with the 2003 -- was when I changed settings on the ac/heat (like from 70F, front fan, to 60F and defrost), the temp would shoot to 80F and I'd get hot air blowing out of all vents. The temp dial wouldn't shift it, I had to shut the whole system down. Normally not a problem, but driving at 70 MPH in rain and you start to fog up your windshield, 80F air does NOT help. It only happened once, but the wreck potential was definitely there.
Stacy
2003 yellow Lux with sunroof, 3rd row seat,painted dash, rear tire carrier
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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2003 yellow Lux, 12" Bulletproof lift, 42" Pitbull Rockers, 20" Ultra Predators, Corsa sport exhaust, painted interior
2004 Cadillac Escalade, white diamond, dual tip chrome exhaust, 20" chrome 9-spoke rims, altezzas - TOTALLED!!!! Replaced with a nondescript 2009 Chevy Tahoe
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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